Saturday

April 18, 2015

April 18, 2015

Posted by **Kyle** on Monday, April 9, 2012 at 9:29am.

(3+9i)-(12-5i)

8+6i/7-5i

- 1 out of 2 -
**Sofia**, Monday, April 9, 2012 at 9:47amRewrite as:

3+9i-12+5i

Add like terms:

-9+14i is your answer.

- math -
**Reiny**, Monday, April 9, 2012 at 10:05amfor the 2nd, multiply top and bottom by 7+5i

(8+6i)/(7-5i) * (7+5i)/(7+5i)

=(56 + 40i + 42i + 30i^2)/(48 - 25i^2)

= (26 + 82i)/73 . remember i^2 = -1

**Answer this Question**

**Related Questions**

Quick math help - please help me solve these problems! Thank you! 1. Simplify: (...

Algebra - 1. Subtract and simplify 18/y-8 - 18/8-y 2. subtract simplify if ...

Algebra 2 - 1. Simplify: sqrt6(sqrt2/2+sqrt3)-sqrt8 2. Simplify: sqrt(72x^3)-5x ...

Algebra - Can you please check my work? You have helped other students I know. ...

Algebra (check my answers) - Please check these answers. Multiply -7(2a2 -4) = -...

Algebra 2 Help - 1.) Solve for x. 2x(x - 12) = -40 2.) Solve for x. 3x2 + 2x = ...

Algebra 2 - 1.) Solve for x. 2x(x - 12) = -40 2.) Solve for x. 3x2 + 2x = 12 - ...

Math - Algebra - Simplify and solve for x=2 and y=5. Please remember to group ...

math - 1)Can z+6/z+1 be reduced any further? 2)Add and simplify v/v^2+8v+16 + 4/...

Math - Simplify: -1+9(5-3m) Solve 10=10-2m Solve: 4b<_-2/3 Simplify: 6v-8-6v+...